remove support for 3.6

Author: nschloe

.github/workflows/ci.yml

@@ -23,7 +23,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: ["3.6", "3.7", "3.8", "3.9", "3.10-dev"]
+        python-version: ["3.7", "3.8", "3.9", "3.10-dev"]
     steps:
       - uses: actions/setup-python@v2
         with:

setup.cfg

@@ -20,7 +20,6 @@ classifiers =
     Operating System :: OS Independent
     Programming Language :: Python
     Programming Language :: Python :: 3
-    Programming Language :: Python :: 3.6
     Programming Language :: Python :: 3.7
     Programming Language :: Python :: 3.8
     Programming Language :: Python :: 3.9